Default.aspx
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<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" > <head runat="server"> <title>无标题页</title> </head> <body> <form id="form1" runat="server"> <div> <div style="text-align: center"> <table border="0" cellpadding="0" cellspacing="0" style="width: 604px; height: 420px; border-left-color: #0033cc; border-bottom-color: #0033cc; border-top-style: none; border-top-color: #0033cc; border-right-style: none; border-left-style: none; border-right-color: #0033cc; border-bottom-style: none; background-color: #cccccc;"> <tr> <td colspan="3" style="height: 35px"> <strong><span style="font-size: 24pt; color: #ff0033">删除所有记录</span></strong></td> </tr> <tr> <td colspan="3" style="height: 35px"> 选择需要清空的表: <asp:DropDownList ID="ddlTable" runat="server" AutoPostBack="True" OnSelectedIndexChanged="ddlTable_SelectedIndexChanged" Width="118px"> </asp:DropDownList> <asp:Button ID="btnDel" runat="server" Height="23px" Text="删除所有记录" Width="87px" OnClick="btnDel_Click" /></td> </tr> <tr> <td colspan="3" style="height: 290px" valign="top"> <asp:Label ID="Label1" runat="server" Height="21px" Text="Label" Width="150px"></asp:Label><br /> <asp:GridView ID="gvTable" runat="server" BackColor="White" BorderColor="White" BorderStyle="Ridge" BorderWidth="2px" CellPadding="3" CellSpacing="1" GridLines="None" Height="263px" Width="491px"> <FooterStyle BackColor="#C6C3C6" ForeColor="Black" /> <RowStyle BackColor="#DEDFDE" ForeColor="Black" /> <SelectedRowStyle BackColor="#9471DE" Font-Bold="True" ForeColor="White" /> <PagerStyle BackColor="#C6C3C6" ForeColor="Black" HorizontalAlign="Right" /> <HeaderStyle BackColor="#4A3C8C" Font-Bold="True" ForeColor="#E7E7FF" /> </asp:GridView> </td> </tr> </table> </div> </div> </form> </body> </html>
Default.aspx.cs
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using System; using System.Data; using System.Configuration; using System.Web; using System.Web.Security; using System.Web.UI; using System.Web.UI.WebControls; using System.Web.UI.WebControls.WebParts; using System.Web.UI.HtmlControls; using System.Data.SqlClient; public partial class _Default : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { if (!IsPostBack) { ddlBind(); gvBind(); } Label1.Visible = false; } //创建数据库连接 protected SqlConnection createCon() { string str = ConfigurationSettings.AppSettings["strCon"]; SqlConnection con = new SqlConnection(str); return con; } //绑定下拉列表框 protected void ddlBind() { SqlConnection con = createCon(); con.Open(); //sql语句查询出所有表的名称 string sqlSel = " SELECT name FROM db2_Tome2.dbo.sysobjects WHERE xtype='U' AND STATUS>=0"; SqlDataAdapter sda = new SqlDataAdapter(sqlSel, con); DataSet ds = new DataSet(); sda.Fill(ds); ddlTable.DataSource = ds.Tables[0].DefaultView; ddlTable.DataTextField = "name"; ddlTable.DataBind(); con.Close(); } //绑定gridView控件显示表中的记录 protected void gvBind() { SqlConnection con = createCon(); con.Open(); string sqlSel = "select * from " + ddlTable.SelectedValue; SqlDataAdapter sda = new SqlDataAdapter(sqlSel, con); DataSet ds = new DataSet(); sda.Fill(ds); //判断表中数据是否为空 if (ds.Tables[0].DefaultView.Count > 0) { gvTable.DataSource = ds.Tables[0].DefaultView; } else { Label1.Visible = true; Label1.Text = "该表中没有记录!"; } gvTable.DataBind(); con.Close(); } protected void ddlTable_SelectedIndexChanged(object sender, EventArgs e) { gvBind(); } //删除表中的记录 protected void btnDel_Click(object sender, EventArgs e) { SqlConnection con = createCon(); con.Open(); //sql语句删除所有记录 string sqlDel = "delete from " + ddlTable.SelectedValue; SqlCommand com = new SqlCommand(sqlDel, con); com.ExecuteNonQuery(); gvBind(); con.Close(); } }